Andrew l



(No Model.)

' A. L. BIKER.

BIPOLAR DYNAMO 0R MOTOR.

NO. 452,718. Patented May 19,1891.

Q b O-k 1 Ow FIGJI.

* UNITED STATES PATENT OFFICE.

ANDREIV L. BIKER, OF NEIV YORK, N. Y.

BIPOLAR DYNAMO OR MOTOR.

SPECIFICATION forming part of Letters Patent No. 452,718, dated May 19,1891.

Application filed February 18, 1891. Serial No. 381,951. (No model.)

To all whom it may concern.-

Be it known that I, ANDREW L. BIKER, a citizen of the United States,anda resident of New York city, county and State of New York, haveinvented -a new and useful Improvement in Bipolar Dynamos or Motors,which improvement is fully set forth in the following specification.

The present invention relates to the construction of the continuousframes constituting the cores and pole-pieces of field-magnets ofdynamos or motors of small size, such as are used for very lightmachinery.

The general object sought'by the invent-ion is economy and facility ofconstruction of a bipolar laminated frame or support for the.field-magnet coils.

The invention consists in the particular construction of the blanks orelements composing the support or frame and their arrangement inbuilding up the same. It will be explained in connection with theaccompanying drawings, in which- Figure I shows one of the pole-blanks,and Fig. II one of the core-blanks. Fig. III is a side elevation; Fig.IV, a plan of the upper core-section, and Fig. V an edge view of one ofthe pole-sections.

In the construction of this device two blanks are used. The blanks shownin Fig. I have inwardly-projecting pole-pieces a, curved in an arcconcentric with the armature, and lateral projections or yoke portions1), having a curved outer edge. On one side the end of the yoke portionis cut off, and in the end of the other is a bolt-hole c. In the poleportion are two bolt-holes d on opposite sides of a line drawn throughthe center of the pole and equidistant from such line. The twopole-sections of the magnet are built up from these blanks, as shown inFig. IV. One set or series of blanks (the inner one, as shown) is turnedin the reverse direction to the other two sets, thus forming on one endof the section a tongue f and on the other end a corresponding recess.If more than three sets of blanks are used, adjacent sets will be turnedin opposite directions. The lower pole-section is built up in the sameway and is the counterpart of the upper section; but in assembling thesections the lower one will be disposed so that its recessed end isbeneath the tongued end of the upper section, and vice versa. The

core-blanks, Fig. II, have straight parallel sides throughout most oftheir length, having a curved edge at one end, while the other end isstraight. In the curved end is a bolt-hole i of the same size as thehole a of the poleblanks. The blank also has two bolt-holes L, whichregister when the blanks are turned in opposite directions and disposedso that the curved ends overlap the square ends. \Vhen a section isbuilt up in this way it presents at oneend a tongue and atthe other arecess corresponding to the same parts of the poleseetions. Onecore-section will be disposed as in Fig. V, the other beingreversed-that is, having its tongued end uppermost. \Vhen the sectionsare assembled, the tongue on one section fits in a recess in theadjacent end of the adjoining section, the holes 0 registering with theholes '2 The bed or support 7.; is a simple casting having two upturnedflanges, to which the magnetic frame is bolted by the bolts Z, whichfasten together the plates, making up the lower pole-section.

By this invention small motors of high efficiency can be produced withgreat rapidityand economy, the blanks being rapidly stamped out by meansof simple dies from sheets of soft wrought-iron. The shape of the blanksor elements is such that there is comparativelylittle waste of the stockfrom which they are cut.

I claim as my invention 1. In a bipolar dynamo or motor, a fieldmagnethaving a continuous laminated frame composed of core-sections andpole-sections connected by lap-joints, the core-section and pole-sectionbeing respectively composed of blanks all of the same pat-tern assembledtogether, substantially as described.

2. A field-magnet having a continuous laminated frame composed of twopole-sections formed of blanks of the same pattern, assembled, asdescribed, so as to form at the end of each section a tongue and at theother a corresponding recess, and two core-sections placed at rightangles with the pole-sections and built up of straight blanks, eachhaving a curved projection at one end, the blanks being assembled toform tongues and recesses corresponding with and fitting those on thepole sections, substantially as described.

3. A field-magnet for a bipolar motor or ened thereto by the bolts whichhold together dynamo, having its magnetic frame composed the elementscomposing said seot-io1'1,substanof horizontal pole-sections alternatingwith tially as described. vertical core-sections and connected therewithIn testimony whereof I have signed this 5 by lap-joints, the saidsections being built up specification in the presence of two snbscrib-I5 respectively of flat blanks of the same pattern ing witnesses.

assembled and bolted together, and a bed or ANDREW L. RIKER. supportconsisting of a casting having" a flat Witnesses: base and two upturnedflanges embracing the SAML. BIKER, Jr.,

10 lower pole-section between them and fast- 1 CHARLES M. KIRBY.

